CVE-2020-25683

Name
CVE-2020-25683
Description
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
NVD Severity
medium
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1882018
Third Party Advisory https://www.jsof-tech.com/disclosures/dnspooq/
Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
Third Party Advisory https://security.gentoo.org/glsa/202101-17
Third Party Advisory https://www.debian.org/security/2021/dsa-4844
Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* dnsmasq >= None < 2.83

Vulnerable and fixed packages

Source package Branch Version Maintainer Status